What has Christianity truly contributed to humanity

[Angrboda]

False. That's no Genetic Fallacy. Rather, it is proof of the Truth of the Greatness of Christianity according to the Teaching of its Divine Founder.

Denying the obvious just makes you foolish.

Now, according to your 1st point, though, I could claim it is a "Genetic Fallacy" to cite Buddha on Buddhism.

Since the point was about the falsehood of your statement, and not any trait of Buddhism, this is a nonsequitur. It's irrelevant. A red herring.